race features:
Animate Chains: You can use your bonus action to create a spectral chain in your empty hands. You are proficient with it while you wield it. The chain is a melee weapon that deals 1d8 bludgeoning damage and has the finesse and reach properties. The chain disappears if it is more than 5 feet away from you for 1 minute or more. It also disappears if you use this trait again, if you dismiss the chain (no action required), or if you die.
Fiendish Weapon Knowledge: You are proficient with flails, whips, and nets.